Conditions can change by the hour during all-day outdoor exploration, but you'll be prepared for anything with this 3-in-1 layering system that delivers best-in-class protection in wet, cold conditions. The heathered, waterproof exterior shell with stretch shields a warm, zip-in liner jacket that's insulated with our new, ultralight ThermoBall, powered by PrimaLoft clusters at the core and PrimaLoft sleeves for versatile warmth.